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习题练习：Physics Unit12: Sound
本习题练习来源于题库网 (https://tiku.one)，是在线习题练习的打印版，您也可以访问本平台网站(https://tiku.one/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://tiku.one/test70.html
 作者: admin  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月07日 09:59  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the followinb3o8)g( ,rq uqp 8ejejfxhsu ij w0a)8xu;i4;g is a false statement?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In general, sound is conducted fastesw -ifp3p( +rv+/n uxnzt through

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the speed of sound o,zyyugahn)c w6jc9/tb03 w fvvi,*5in a steel rod?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the temperature o,p6e4. j mbguyf the air increases, what happens to the velocity of sound? (Assume that all bg6jm. 4,ep uyother factors remain constant.)

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocity of a 400 Hz sound, the veloc3q4 g.swcm gx2ity of a 200 Hz sound through air iqgc 3x42m.sg ws

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelength of a 400 Hz sound, t7;xs t4vcup c 553acebhe wavelength of a 200 Hz sound in air is bsc34ex t 5;pvau5c7c

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations wit e wtbd2bsokdvz2v+(*i;6m 5rh frequencies greater than 20,000 Hz are called

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequency less than 20 Hz arem/-c xj+bv 6gpkkk- s8 called

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a sound sour fc7q bsqaht 7+l04jw/ce is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the ftcwf q7/lq ajs4 b70+hrequency of the sound will be

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging waves, intensity is proportional tono6 7t-pv n9l 5a ,jhe0clt6rd

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity of a point source at a distancm o0i* 8b,gpen 2jl4fme d from the source is I. What is the intensity at a distance 2d f08p2emg,f* lon4 imjbrom the source?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound source thfh(w2k 3c(jt35 u(jk kim:bqkat is radiating equally in all direc(i(bhqmt k j 5wj(uc33kkk:2ftions. What happens to the intensity of the sound? It reduces to

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound source that is radiating eeamggh+ o133 tc 8wo5j:sa4qfqually in all di:a53sca o+t q31g jg fmwe8ho4rections. What happens to the intensity level of the sound? It drops by

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following incre3 (6 s6wbqu4 c bqvov1w94yioqases as a sound becomes louder?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You move slowly toward a speaker emitting a pure tone. What charact oc-23 mcz3teq .7 2r v(cyxy+hwue;aneristic of the sound increaseh v 3-m2yw+c xe eoc.cyz7(;3raq 2tnus?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" vdzx )iyrbhgk,ok3mk ,jc/x7+q89n) of a musical note?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pib+-+:rxad6l yhjnw x+ tch" of a musical note?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from air into wate,9e; ks.4jfy xmlxq8vr

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacem796;sni v5s1vxf6obunme o y ,ent waves are

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing wave ondnfq.3n l, +t/l fto;u a guitar string and the sound wave generated by the guitar as a result of thift+q nofl,.l;/u3ntds vibration. What do these two waves have in common?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is open at both ends, thmxx,nz4p 7k h,ere

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an open pipe of length L. What are the wavelengths ofa7rea4a e41dld, b jy7 )7tln0n(uag o the three lowest tones pro7uag0na not4)1 ( 7el,e 4ladrjd7a ybduced by this pipe?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipe of length L ipf/ rbgrn6 lzgl-4neg7 ,5f1n s 200 Hz. Which one of the following frequencies will not resonate in the s-r/gg1l6bn pzgrf,e5lf7nn 4 ame pipe?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An open pipe of length L is resonating at its fundamental frequency.ooj)ci/sio7v4,y44vf i u c8l Which statement is co u7c4ljo fvi 4os/y)ici,o 84vrrect?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is open at one end and closed at the other, ther8drlr 6st9akg5rt;qvw( qx48e

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a closed pipe of length L. What are the wx1c.yijh1 t d-avelengths of the three lowest tones produce h1y1j-xid ct.d by this pipe?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in a closed pipe of length L is 200 Hz. Which of thyqf5xqfzk 9dk301 * lne following frequencies wkxk fdz5q3y1 *qfnl0 9ill not resonate in that pipe?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pipe of length L closed at rt8qu(yvf1mr oo5 w( 2one end is resonating at its fundamental frequency. Which statement is c1rum5f2r( vo wo 8(qtyorrect?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands betweevlry s94/l1 xln two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day wh x9s1r yl/l4vlen the speed of sound is 330 m/s. The person is
1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In order to produce beats, then,y19;0n uwcwvbcfka 5 o /mh9 two sound waves should have

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two pure tones are sounded together and a par c1+hjgot3ozs qt;(2uticular beat frequency is heard. What happens to the+go1s2 z(joqhc;t u3 t beat frequency if the frequency of one of the tones is increased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explainsyv i n0 wqm.vzs0zp75+

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approaches a stationary observer. The f (a.bw5iyudhga 38jstw4x 5l0requency heard by the observerw.g(us0wy8 h5xa i4jat 3db5l is

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs from a stationary observer. The fko+i7 . lec3bv bz 3)fe6e zy)f6hmf4vrequency heard by the obse )k6le vz.vfbo67 4)zey c3f+ebhfmi 3rver is

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a jet plane were to g96 bjhs +mxz6n+xb j oa4f5z6double its MACH-speed, its half-angle will decrease by a factor o gxb5oz6sxa+b6+n9zj 4 f m6jhf:

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The speed of an ultrasonigtpia (wtz-lh*6 g.5 ec sound of frequency 45 kHz in air is 352 m/s. What is the air temperatuh(ptiega w5t6* lgz- .re?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the speed of sounds4mb4q dk/ ckq6v3s,;thm (cf in air at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a day when the speed of sound in air is 340 m/s, a bat emits a sy;zkk6gff /q; vu+z-shriek whose echo reaches it 0.0250 s later. How far away was the kfzy;z -; / gsvqkuf6+object that reflected back the sound?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You shout at a cliff, and hear the echo in 4.00 s. Tu9tx6h3doi( s he temperature is $0 \; ^{\circ}C$. How far away is the cliff?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you hear thunder 5.0 s after seeing a flash of lightning, the di p gpr,rba1b60stance to the lightning strike is abo1pr bga6pb0, rut

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An echo is heard 2.0fp(h8t.lk 8nae/l nmy4:wu 6sxmy 8s1lg 8wd5 s from a cliff on a day the temperature is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a $30 \; ^{\circ}C$ day, there is an explosion. The sound is heard 3.4 s after seeing the flash. How far away was the explosion?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You drop a stone into a deep well and hear the splash 2.5 s later. How detjm1 6s dl+uy eecsg4nz5qn7h31r6x7 ep is the well? (Ignore air resi6 c mu6 q153 yxnz4e+dnl1j esh77tgsrstance, and assume the velocity of sound is 340 m/s.)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelength in air of a sound wave of frequenc*sd.eg0 o(.q3(hj;bpzxpd li v m0pl-y 500 Hz is

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in airxn9w(k * wnl7l at $23 \; ^{\circ}C$ enters a cold front where the air temperature is $2 \; ^{\circ}C$. If the sound frequency is 1500 Hz, determine the wavelength in the warmer air and in the colder air.

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity lealy4;y-qqykb 2 29n povel of a sound with intensity $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity o0,s0:xlqosu/x re -jf 3 4wpfvf a 70-dB sound?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the intensities of two sounds wit4ly6labs,k2 f h intensity levels of 70 dB and 40 dBa,lsb6 2 fkly4?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 engines in a garage is 100 dB. What is the inteni; : x+a+utmtjsity level generated b:m+t+ j;uia txy one engine?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of hrm+tj6; *:kb z3qcoh1 3akw)rs8gi gz(mv1z6.0 m from a source that is radiating equally in all dir a1( vbw3sthrgmo8zk1q)6r m3 zic z*hj;kg+:ections is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m k(-w-a z;kntu from a source that is radiating equally in al (k wnkz;-ta-ul directions is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A barking dog delivers about 1 mW of power, wh:y60po/jmt7ahopf 7 ha+2 q;bod4jfr ich is assumed to be uniformly distaqhj 7b7 rfj;o:264opyh+fa o0/dpm tributed in all directions. What is the intensity level at a distance 5.00 m from the dog?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level is eb s4xj g8o/,i65 dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very clxiesoj4b 8 /,gose to each other are barking?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a distance of 15 m from a sound source the intensity leve0p oto 43cw-kjl is 60 dB. What is the intensity level (in0pctk3 ojw- 4o dB) at a point 2.0 m from the source? Assume that the source radiates equally in all directions.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity xh.: h,a;l arlivs :8slevel 5.0 m from a point source is 95 dB. At what distance will it be,v8la s; .::ilash xrh 75 dB?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The third harmonic of a complex tone has a frequency of 1200 hnm-lj+9 ,lhbHz. What is the frequency of thl+jb,h - 9mlhne fourth harmonic?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the third harm3m* 3*rt ofuf9;qhomvonic of an open pipe is 900 Hz. What is the length of t v tmo3fom3*huq;9 *rfhe pipe?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipe of length L is 400 Hz. What is t* (()huvff fpkh7fp4q he frequency of the lowest tone that will resonate in an open pipe of hf7phf ( f*fuvpqk)4 (length 2L?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An organ pipe open at both ends has a length of 0.80xezrkcs04d byn 6 n7ive7:w6 + m. If the velocity of sound in air is 340 m/s, what is the frequenci 7n:cxkn60yv esdzew746 br+ y of the second harmonic?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room where the tempe3)r35czq li sbc;2y gzrature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The fundamental frequency in a pipe closed at one end is 330 Hz. What8hdmw,os)d ) w/ fueh0 is the frequency of the thirwmwo8) )hsduh/dfe0, d harmonic?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the length of the shortest pipe clos v l) 58o7xn,j:qrh vdh0b4jdqed on one end that will have a fundamental frequdd)hqvj nl:h8r0v4q ojb 7x,5ency of 60 Hz on a day when the velocity of sound is 340 m/s?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room where the temperatur .o :d5glj.hkre is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room where the temperature icrx7/ xg(llit kn,t*/s $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A closed organ pipe of length 0.75 m is played2:ia. /buu6bp,xczyq wm4aor * *f ac, when the speed of sound in air is 340 m/s. What is the fundamental frequ4aczarf ba*cp:/ubo 2,y uq* .6xim,w ency?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes of the same length: one ykbz86o(xyt)+eqpcu-lj; y- is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequyk8( oejtc-zpy6lu)bqy x;+ -ency of the closed pipe?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two adjacent sources each emit a frequency of 800 Hzn i ainz 3pb*wz:q9xj1k+)i*n in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in9:q3+zpi*kj nbnx1 n ai )*wzi front of the sources would hear no sound?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two speakers are placed side by side and dr;mtacx r:45 mm v ;o-imkg::mkiven by the same frequency of 500 Hz. If the distance from a;mri v; c :m-m:otkkgxam54: m person to one speaker is 5.00 m and the person detects little or no sound, which of the following is a possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two tunes have frequencies of 440 Hz and 444 Hz. Wvjry2wp f-nd. bc qa0 8ow*/c*hat is the beat frequency?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A music tuner uses a 550-Hz tuning fork to tune the frequency of a musical c9:q)nz5p(6xfv la e oinstrument. If the tunc6pn aoxe)5(:9zl vqf er hears a beat frequency of 2 Hz, what is the frequency of the instrument?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelengths of the sounds produced by two horns are l4/hg3a jw /f2grnvd/ e /y,rs6 m and 7 m respectively. What beat frequency is heard when the horns a v2 fd//jye,lwgr/n a4hsg 3r/re sounded on a day when the velocity of sound is 340 m/s?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violin strings on two violins in an orche edxbo:moab4ze,k nc,am )v 1ai/p/97 stra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings would bring them to the sam,o,1)a7c:oa amb/xed9n im vbk4 ezp/e frequency?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches a stationary 1000-Hz sound source at twice t26; fktd p:rtthw-mx.he speed of sound. The m h :.rwt ;dxp6-k2fttobserver hears a frequency of

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normal frequency of 1000 Hz) approaches a stationary observ9.syd.o dg14y hyp g*ter at one-half the speed. t.9dgyyhopy s 1*dg4 of sound. The observer hears a frequency of

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound has a frequency of 1000 Hz. If a listener moves wit0 9+/ypuuqikmz6 x(5f1j syyrh a speed of 30 m/s away from the source, what is the frequency heard by the observer?u/ryj0u yf9mkypz(+ 1q6i5 sx (The sound speed is 340 m/s.)

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A police car has an 800-Hz siren. It is traveling at 35 m/s on a d zx;*( 4orxmphay when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing aloxr4x*mz ; (phong the roadside. What change of frequency does the observer hear?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the frequency heard by a stationary observg (fjx q2o4zlx5 y4h-per when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speogqxzyph 454 -j( lfx2ed of sound is 340 m/s.

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling toward yoms 18woakny2or j 1,)ru at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whataws1yj 8rkmo, rn1)o2 frequency do you hear?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are moving at 120 km/h towdlxu0yx q *0n(ard a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do xly *0q(nd0uxyou hear?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling poc oj 1;4f*xycpf lq5q0;ps 3away from you at 120 km/h. The train blows its 400-Hz whistle. 1;4xspy 5 oqf3jlppcf o 0;*cqTake the speed of sound to be 340 m/s. What frequency do you hear?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from you at 12uygas3 vu8 +7dr,1un n0 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the acanvu31u dry8 7gn+us,tual frequency of the whistle?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 500 Hz. Assume4ffbopcvra,wj ,djg.i13 ncw 2/p y46 the speed of sound in air is 340 m/s. Wh2 iaf/w,yb3 jfcpo.j cr, 44wvgpn1d6at is the frequency heard by an observer if the observer is moving away from the train with a speed of 30.0 m/s?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 500 Hz. Assume the speed of q n.47-2yqnw mwecj.g7 e.knqsound in air is 340 m/s. What is the frequency hqgm.e y477ekc qw-j.wnn .n2qeard by an observer if the observer is approaching the train with a speed of 30.0 m/s?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sonar is used to determine the sp:z4ds7 mmd 7tveed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object movint :4v7mdz d7msg?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The half angle of the ou-2* yxeqzx*conical shock wave produced by a supersonic aircraft is $60^{\circ}$. What is the Mach number of the aircraft?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet flies at a speoc 3/enmm 3a/-bpu0p 6nf 9ppled of Mach 1.4. What is the half-angle of the conical shock wave formed?n epma/6m3f/lbppun90c - op3

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flies from the Unitea8wwd2b5rs tki kt ( 0.mkt:6pd States to Europe with a Mach number of 1.05 where the air tempkmdstrab8 (w5ptwi k: kt.62 0erature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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